Bring sugar, water & basil to a boil. Stir so the sugar dissolves. Discard basil & chill syrup in a jar in the fridge until ready to use. This syrup stays fresh for up to a week.
Fill a cocktail shaker with ice. Add the basil syrup, lemon juice, St. Germaine & vodka. Shake well. Strain into a chilled martini glass. Top with sliced basil & tonic water.
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